Dear colleagues,
I would like to use the XFEM module in Abaqus but do not know what is there. So, what I would like to know is:
(1) Can it do 3D crack growth?
(2) Can it do both LEFM and cohesive cracks?
(3) Is this right that the bulk material can be of any type (elastic/plastic etc.) for an XFEM analysis? Or it just deals with elastic bulk materials?
(4) Can it do dynamic crack propagation?
(5) What are the output for the crack geometries? As I would like to have another FE analysis on the cracked structure.
Thanks for your time.
Best regards from Melbourne,
Phu Nguyen
Hi Phu,
As far as I know:
Yes you can do 3D crack growth. We use it through LEFM by treating the cracks as stationary ones and then with an algorithm we propagate the cracks automatically. In this way we observe no divergence issues. Otherwise you might face a lot of convergence problems by using XFEM directly on propagating cracks. I guess the default implemented way for propagating cracks is through cohesive relation. The bulk material can only be elastic.
See you,
Tuncay
Hi,
please check the attached file for some description about XFEM.
Highly recommend you to use embedded strong discontinuity approach! It is more efficient
Yours sincerely,
DO XUAN NAM
Hi Phu,
Blow are what I know for the XFEM in abaqus.
(1) Yes. It can do 3D crack growth.
(2) Yes. It can do both XEFM and cohesive crack. However, there seems to have convergence issue when I try to have a crack defined by XFEM in bulk material changed to cohesive failure using cohesive surface method in abaqus.
(3) It can deal with material nonlinear as the data input is quite similar to cohesive method, including cracking initiation stress/strain and crack propagation fracture energy.
(4) It seems that currently XFEM can not be used in abaqus Explicit.
(5)Normally PHILSM (Signed distance function to describe the crack surface) and PSILSM (Signed distance function to describe the initial crack front)can be output.
The XFEM in abaqus is quiet like VCCT method, it can only deal with single crack , but having issues with the interactions with many cracks.
I've also found that the convergence is related to the input material properties. Currently it is only valid for first order solid continuum elements.
Regards,
Qingqing
I would like to mention that despite limitations as described above, ABAQUS-XFEM has been used to model the crack propagation and the manuscript is attached for reference.
I believe it does not work in cases where contact interactions exist between different bodies, for example: bearing contact as in bolted connections
if you want to learn XFEM by a simple example, read it...
https://en.banumusagr.com/extended-finite-element-method-xfem-step-by-step-example-for-abaqus-users/
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